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how to calc power factor? #45990
12/09/04 08:31 PM
12/09/04 08:31 PM
R
rather_large_ben  Offline OP
Member
Joined: Oct 2004
Posts: 18
How do engineers calculate power factor on a ckt before anything is hooked up? Are motors all similar 80 percent-ish and they just estimate, or can they calculate it exactly.
The power company wants load calcs including power factor. Thanks, Ben

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Re: how to calc power factor? #45991
12/09/04 09:43 PM
12/09/04 09:43 PM
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RobbieD  Offline
Member
Joined: Feb 2003
Posts: 231
Canada
On motors look on the talley plate.

Re: how to calc power factor? #45992
12/09/04 09:47 PM
12/09/04 09:47 PM
R
rather_large_ben  Offline OP
Member
Joined: Oct 2004
Posts: 18
so if the nameplate says 1hp, and it says 7 amps at 120V, then 746/840= 89 percent power factor?


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